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MC34167D2T Datasheet(PDF) 11 Page - ON Semiconductor |
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MC34167D2T Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page MC34167 MC33167 11 MOTOROLA ANALOG IC DEVICE DATA Figure 24. Triple Output Converter 4 2 1 5 3 + VO1 5.0 V/3.0 A EA Reference Thermal Oscillator S R Q PWM UVLO ILIMIT Vin 24 V 1000 + 6.8 k 68 k 0.1 1N5825 + 1000 1000 + 1000 + MUR110 MUR110 VO3 –12 V/200 mA VO2 12 V/250 mA T1 + + Tests Conditions Results Line Regulation 5.0 V 12 V –12 V Vin = 15 V to 30 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 200 mA 3.0 mV = ± 0.029% 572 mV = ± 2.4% 711 mV = ± 2.9% Load Regulation 5.0 V 12 V –12 V Vin = 24 V, IO1 = 30 mA to 3.0 A, IO2 = 250 mA, IO3 = 200 mA Vin = 24 V, IO1 = 3.0 A, IO2 = 100 mA to 250 mA, IO3 = 200 mA Vin = 24 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 75 mA to 200 mA 1.0 mV = ± 0.009% 409 mV = ±1.5% 528 mV = ± 2.0% Output Ripple 5.0 V 12 V –12 V Vin = 24 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 200 mA 75 mVpp 20 mVpp 20 mVpp Short Circuit Current 5.0 V 12 V –12 V Vin = 24 V, RL = 0.1 Ω 6.5 A 2.7 A 2.2 A Efficiency TOTAL Vin = 24 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 200 mA 84.2% # TURNS(SEC) + VO(SEC) ) VF(SEC) VO(PRI))VF(PRI) #TURNS(PRI) Multiple auxiliary outputs can easily be derived by winding secondaries on the main output inductor to form a transformer. The secondaries must be connected so that the energy is delivered to the auxiliary outputs when the Switch Output turns off. During the OFF time, the voltage across the primary winding is regulated by the feedback loop, yielding a constant Volts/Turn ratio. The number of turns for any given secondary voltage can be calculated by the following equation: T1 = Primary: Coilcraft M1496–A or General Magnetics Technology GMT–0223, 42 turns of #16 AWG on Magnetics Inc. 58350–A2 core. T1 = Secondary: VO2 – 69 turns of #26 AWG T1 = Secondary: VO3 – 104 turns of #28 AWG Heatsink = AAVID Engineering Inc. 5903B, or 5930B. Note that the 12 V winding is stacked on top of the 5.0 V output. This reduces the number of secondary turns and improves lead regulation. For best auxiliary regulation, the auxiliary outputs should be less than 33% of the total output power. |
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